Estimate Your New Hampshire Child Support in Minutes
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New Hampshire Child Support Calculator
Estimate based on NH guideline percentage summaries (heuristic). For informational purposes only.
Disclaimer: This calculator is for educational purposes and does not constitute legal advice. Results may differ based on judicial findings, parenting plan details, allowable deductions, and guideline deviations.
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Frequently Asked Questions
Child Support in New Hampshire
Discover what you need to know about Child Support Laws in New Hampshire.
New Hampshire calculates child support under RSA 458-C (New Hampshire Child Support Guidelines).
New Hampshire primarily uses a percentage-of-income model, meaning child support is generally calculated as a percentage of the obligor parent’s gross income.
The standard guideline percentages are:
1 child: 25%
2 children: 33%
3 children: 40%
4 or more children: 45%
The guideline amount is a rebuttable presumption, meaning courts begin with it but may deviate when appropriate under statutory factors.
For an estimate tailored to your situation, you can use the Deliberately.ai child support calculator above—but only a court order is legally binding.
Child support in New Hampshire is commonly influenced by:
The obligor parent’s gross income
The number of children
Health insurance costs for the child
Work-related childcare expenses
Shared parenting or split custody arrangements
Court-approved deviations when application of the guidelines would be unjust or inappropriate
Courts may deviate from guideline amounts if strict application would not be in the child’s best interest.
There is no universal amount.
The presumptive support amount depends primarily on:
The obligor parent’s gross income
The number of children
Whether shared or split custody adjustments apply
Any approved deviations
For a reliable estimate before filing or negotiating, use the Deliberately.ai calculator above—keeping in mind the court has final authority.
In most cases, child support ends when the child:
Turns 18, or
Turns 19 if still attending high school
Support may end earlier if the child becomes legally emancipated.
Your specific court order language still controls.
Not automatically in practice.
Wage withholding may continue unless formally terminated.
Any arrears remain owed even after the ongoing support obligation ends.
Always confirm termination procedures with the court before stopping payments.
Yes.
A child support order may be modified when:
There has been a substantial change in circumstances, or
Three years have passed since the last order and recalculation would result in a significant difference.
Modifications generally apply prospectively (from the filing date), not retroactively to past-due support.
Timeframes depend on:
Whether the case is contested
Court scheduling
Whether income or parenting time is disputed
Uncontested matters may resolve more quickly than contested cases.
New Hampshire child support is intended to cover:
Housing
Food
Clothing
Transportation
Basic living expenses
Additional expenses such as health insurance and childcare are typically addressed separately in the court order.
It can—but only if:
The court includes those costs in the support calculation, and
The order reflects the adjustment.
Paying expenses outside the court order does not automatically reduce your obligation.
New Hampshire generally uses gross income, which may include:
Wages and salary
Bonuses and commissions
Overtime
Self-employment income
Rental or investment income
Other recurring income
If a parent is voluntarily unemployed or underemployed, the court may assign income based on earning capacity.
Nonpayment may result in enforcement actions such as:
Wage garnishment
Tax refund intercept
Liens
License suspension
Contempt proceedings
Arrears continue to accumulate until paid in full.
Arrears generally:
Remain owed until paid
May be collected through enforcement tools
Do not disappear when the child reaches the age of majority
Child support cases are handled through New Hampshire Family Division courts and/or New Hampshire Child Support Services.
If income or deviation factors are likely to be contested, consulting a New Hampshire family law attorney before filing can help avoid delays and mistakes.
Yes.
Income withholding is common, and courts or child support enforcement agencies may use additional collection methods when necessary.
Not automatically.
New Hampshire has specific provisions for shared parenting and split custody, and the calculation may differ depending on how parenting time is structured.
Even in shared custody situations, support may still be owed depending on income differences.
In certain cases involving disability or special needs, support may continue beyond age 18 (or 19 if still in high school), depending on court findings.
These cases can be legally complex and may require legal guidance.
Parents generally cannot privately override a court order.
Any modification or termination must be approved by the court to be enforceable.
A lawyer is not required for straightforward cases, but it is strongly recommended when:
Income is disputed
Self-employment is involved
Arrears exist
A deviation is requested
Parenting time or custody is contested
You will typically need:
Recent pay stubs
Tax returns
Proof of health insurance costs
Documentation of childcare expenses
Existing court orders
Incomplete documentation can delay proceedings.
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How Long Does a Child Support Modification Take in Louisiana?
Michigan calculates child support using the Michigan Child Support Formula (MCSF), which Michigan courts are required to use when setting or changing child support.
Michigan’s approach is based on an income-shares model, meaning the formula estimates what parents would have contributed toward the child if they lived together, then allocates responsibility between parents.
The calculation is based on:
Both parents’ incomes (used to determine each parent’s support share)
Number of children
A statewide support schedule/formula inputs (per MCSF)
Parenting time / overnights (Michigan applies a parental time offset when overnights can be determined)
Medical support (health insurance and ordinary medical considerations)
Work-related childcare expenses
Other adjustments and court-approved deviations under the MCSF
For an estimate tailored to your situation, you can use the Deliberately.ai child support calculator above—but only a court order is legally binding.